org.topbraid.shacl.expr

Class AbstractNodeExpression

java.lang.Object

org.topbraid.shacl.expr.AbstractNodeExpression

All Implemented Interfaces:

NodeExpression

Direct Known Subclasses:

ComplexNodeExpression, ConstantTermExpression, FocusNodeExpression

public abstract class AbstractNodeExpression
extends Object
implements NodeExpression

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	AbstractNodeExpression(org.apache.jena.rdf.model.RDFNode expr)

Method Summary

Modifier and Type	Method and Description
org.apache.jena.util.iterator.ExtendedIterator<org.apache.jena.rdf.model.RDFNode>	evalReverse(org.apache.jena.rdf.model.RDFNode valueNode, NodeExpressionContext context) Produces an iterator of focus nodes for a given value node.
List<NodeExpression>	getInputExpressions()
org.apache.jena.rdf.model.Resource	getOutputShape(org.apache.jena.rdf.model.Resource contextShape) Gets the shape of the output data (if known), based on a context shape.
org.apache.jena.rdf.model.RDFNode	getRDFNode() Gets the RDF node that was used to construct the expression, in the SHACL node expressions syntax.
boolean	isReversible(NodeExpressionContext context) Checks if this expression could be evaluated in the reverse direction, with a value given and then finding all focus nodes.
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.topbraid.shacl.expr.NodeExpression

eval, getFunctionalSyntax, getTypeId, visit

Constructor Detail

AbstractNodeExpression

protected AbstractNodeExpression(org.apache.jena.rdf.model.RDFNode expr)

Method Detail

evalReverse

public org.apache.jena.util.iterator.ExtendedIterator<org.apache.jena.rdf.model.RDFNode> evalReverse(org.apache.jena.rdf.model.RDFNode valueNode,
                                                                                                     NodeExpressionContext context)

Description copied from interface: NodeExpression

Produces an iterator of focus nodes for a given value node. This operation can only be called for node expressions where isReversible returns true and may throw an IllegalStateException otherwise.

Specified by:

evalReverse in interface NodeExpression

Parameters:

valueNode - the value node

context - the context

Returns:

an iterator (never null)

getInputExpressions

public List<NodeExpression> getInputExpressions()

Specified by:

getInputExpressions in interface NodeExpression

getOutputShape

public org.apache.jena.rdf.model.Resource getOutputShape(org.apache.jena.rdf.model.Resource contextShape)

Description copied from interface: NodeExpression

Gets the shape of the output data (if known), based on a context shape. For example, for a path expression it would try to infer the output shape from the sh:class or sh:node of the property (path).

Specified by:

getOutputShape in interface NodeExpression

Parameters:

contextShape - the shape where the evaluation would start, e.g. the node shape of the sh:values statement

Returns:

an output shape or null if unknown

getRDFNode

public org.apache.jena.rdf.model.RDFNode getRDFNode()

Description copied from interface: NodeExpression

Gets the RDF node that was used to construct the expression, in the SHACL node expressions syntax.

Specified by:

getRDFNode in interface NodeExpression

Returns:

the RDF node

isReversible

public boolean isReversible(NodeExpressionContext context)

Description copied from interface: NodeExpression

Checks if this expression could be evaluated in the reverse direction, with a value given and then finding all focus nodes. The function evalReverse can then be called. NOTE THAT THIS IS CURRENTLY BARELY IMPLEMENTED.

Specified by:

isReversible in interface NodeExpression

Parameters:

context - the context

Returns:

true if reversible

toString

public String toString()

Overrides:

toString in class Object